The two Yourhead ones (Collage and Stacks) have updates available that are compatible with Catalina. There’s a full list here: 🔥 RapidWeaver 8.4 and macOS Catalina Plugin Compatibility). If the ‘Update Plugin’ button doesn’t do anything, you can re-download Stacks here: http://info.yourhead.com/stacks/ (just grab the latest update of whatever version you have) and Collage here: http://info.yourhead.com/collage/ and then (if required) re-enter your licence.
RapidCart has an update as well but it’s on to Rapidcart Pro 4 now - I don’t know if you can still get earlier versions (or if they made those compatible). RapidSearch Pro is defunct now it looks like - there’s an announcement about that here: https://rapidsearchpro.com/rapidsearchpro/
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